Route description[edit]
SR27 looking south from Stoney Point.
SR 27 begins at SR 1 right next to the Pacific Ocean and Topanga County Beach, in an unincorporated area of Los Angeles County between Malibu and Castellammare. It travels north as Topanga Canyon Boulevard, cutting through Topanga State Park. Upon exiting the park, SR 27 provides access to Fernwood, Topanga, Sylvia Park, and Glenview, all unincorporated. SR 27 continues winding into the San Fernando Valley, nearly entering Calabasas before entering the Los Angeles community of Woodland Hills. The route becomes a major city arterial through the valley, intersecting US 101 before entering Warner Center and Canoga Park. After traversing Chatsworth, SR 27 ends just past an interchange with the SR 118 freeway, thus providing access to the unincorporated area north of Chatsworth.[2]
Metro Local line 245 runs on Topanga Canyon Boulevard.[citation needed]
Except for a small portion in the mountains, SR 27 is part of the National Highway System,[3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[4] SR 27 is eligible for the State Scenic Highway System.[5] A portion has been officially designated as a scenic highway by the California Department of Transportation.[6][7]

History[edit]
The original state highway system in 1933 included a highway from near Topanga Beach to Montalvo-San Fernardo Road near Chatsworth.[8] Two years later, this was numbered as Route 156.[9] The route was redesignated as SR 27 in the 1964 state highway renumbering.[10]

Major intersections[edit]
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in Los Angeles County.
Location
Postmile
[1][11][12]
Destinations
Notes
​
0.00
SR 1 (Pacific Coast Highway) – Malibu, Santa Monica
South end of SR 27
Los Angeles
11.06
Mulholland Drive
Former SR 268
12.28
Ventura Boulevard
Former US 101 and US 101 Bus.
12.43
US 101 (Ventura Freeway) – Ventura, Los Angeles
Interchange
​
Victory Boulevard
18.63
Devonshire Street – San Fernando
Former SR 118 east
​
Santa Susana Pass Road
Former SR 118 west
20.06
SR 118 (Ronald Reagan Freeway)
Interchange; north end of SR 27
20.06
Poema Place, Mayan Drive
Continuation beyond SR 118
1.000 mi = 1.609 km; 1.000 km = 0.621 mi